linux-kernel - Re: [PATCH v2 0/9] arch: riscv: add board and SoC DT file support

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Date:   Thu, 07 Jan 2021 19:12:26 -0800 (PST)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     yash.shah@...ive.com
CC:     linux-spi@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-pwm@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
        broonie@...nel.org, Greg KH <gregkh@...uxfoundation.org>,
        aou@...s.berkeley.edu, lee.jones@...aro.org,
        u.kleine-koenig@...gutronix.de, thierry.reding@...il.com,
        andrew@...n.ch, peter@...sgaard.com,
        Paul Walmsley <paul.walmsley@...ive.com>, robh+dt@...nel.org,
        bgolaszewski@...libre.com, linus.walleij@...aro.org,
        yash.shah@...ive.com
Subject:     Re: [PATCH v2 0/9] arch: riscv: add board and SoC DT file support

On Mon, 07 Dec 2020 20:55:32 PST (-0800), yash.shah@...ive.com wrote:
> Start board support by adding initial support for the SiFive FU740 SoC
> and the first development board that uses it, the SiFive HiFive
> Unmatched A00.
>
> Boot-tested on Linux 5.10-rc4 on a HiFive Unmatched A00 board using the
> U-boot and OpenSBI.
>
> This patch series is dependent on Zong's Patchset[0]. The patchset also
> adds two new nodes in dtsi file. The binding documentation patch
> for these nodes are already posted on the mailing list[1][2].
>
> [0]: https://lore.kernel.org/linux-riscv/20201130082330.77268-4-zong.li@sifive.com/T/#u
> [1]: https://lore.kernel.org/linux-riscv/1606714984-16593-1-git-send-email-yash.shah@sifive.com/T/#t
> [2]: https://lore.kernel.org/linux-riscv/20201126030043.67390-1-zong.li@sifive.com/T/#u
>
> Changes in v2:
> - The dt bindings patch is split into several individual patches.
> - Expand the full list for compatible strings in i2c-ocores.txt
>
> Yash Shah (9):
>   dt-bindings: riscv: Update DT binding docs to support SiFive FU740 SoC
>   dt-bindings: spi: Update DT binding docs to support SiFive FU740 SoC
>   dt-bindings: pwm: Update DT binding docs to support SiFive FU740 SoC
>   dt-bindings: serial: Update DT binding docs to support SiFive FU740
>     SoC
>   dt-bindings: gpio: Update DT binding docs to support SiFive FU740 SoC
>   dt-bindings: i2c: Update DT binding docs to support SiFive FU740 SoC
>   riscv: dts: add initial support for the SiFive FU740-C000 SoC
>   dt-bindings: riscv: Update YAML doc to support SiFive HiFive Unmatched
>     board
>   riscv: dts: add initial board data for the SiFive HiFive Unmatched
>
>  .../devicetree/bindings/gpio/sifive,gpio.yaml      |   4 +-
>  .../devicetree/bindings/i2c/i2c-ocores.txt         |   8 +-
>  .../devicetree/bindings/pwm/pwm-sifive.yaml        |   9 +-
>  Documentation/devicetree/bindings/riscv/cpus.yaml  |   6 +
>  .../devicetree/bindings/riscv/sifive.yaml          |  17 +-
>  .../devicetree/bindings/serial/sifive-serial.yaml  |   4 +-
>  .../devicetree/bindings/spi/spi-sifive.yaml        |  10 +-
>  arch/riscv/boot/dts/sifive/Makefile                |   3 +-
>  arch/riscv/boot/dts/sifive/fu740-c000.dtsi         | 293 +++++++++++++++++++++
>  .../riscv/boot/dts/sifive/hifive-unmatched-a00.dts | 253 ++++++++++++++++++
>  10 files changed, 590 insertions(+), 17 deletions(-)
>  create mode 100644 arch/riscv/boot/dts/sifive/fu740-c000.dtsi
>  create mode 100644 arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts

Thanks, these are on for-next.  There was one checkpatch warning about the
missing ISSI device tree entry, but we already had that in the FU540 so I'm OK
letting it slide.

I'm also not really sure this is the right way to do this sort of thing: most
of the patches here really aren't RISC-V things, they're SiFive SOC things.
Some of these patches have been picked up by other trees, but I just took the
rest.  I'm not all that happy about taking DT bindings for things like GPIO or
PWM bindings, but as they're pretty small I'm OK doing it in this instance.

In the future it would really be better to split these up and land them via
their respectitve trees, rather than trying to do all the SOC stuff over here.
I know that can be a headache, but we have that SOC group for this purpose to
try and keep things a bit more together -- I know it was a while ago and there
really hasn't been much SOC activity on the RISC-V side of things so maybe it
hasn't been that widley discussed, but that was really designed to solve these
sorts of problems.